Posted by Steve@Advance on October 18, 2021 at 15:34:06 from (47.37.93.118):
In Reply to: Tractor coils posted by 300jk on October 18, 2021 at 15:10:35:
The NAPA coil that requires no resistor is a NAPA IC14SB.
There are others, just different applications. If this is the one you have, it will work. Be sure the part number is actually printed on the can of the coil, not on the box. They are often resold and reboxed, mixed up by unfamiliar counter people. If you have a different number, research what you have, it might be OK. Again, go by the number on the coil, not on the box it came in or any printing on the coil, strictly by the factory number!
To test it, put an ohm meter across the primary terminals, out of circuit (nothing connected to the terminals). Set the meter on the lowest setting, read carefully and be sure the test leads are making good connection without touching them with your fingers. It should read close to the 3 ohms.
Another test, run the engine long enough to get it up to temperature. Check the spark output. From the coil tower to ground it should give minimum 3/4 inch spark, and the coil can should not be noticeably hotter than the surrounding components. If it is too hot to hold, it is the wrong coil.
The Pertronix kits are tough. But they do require the correct coil. Running a 6v coil without a resistor will eventually burn up the electronic trigger and/or the coil. Running a 12v coil with a resistor will not hurt the trigger or burn up the coil, but will have trouble starting and always have a weak substandard spark.
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